WO2013140887A1 - マスクブランク、転写用マスクおよびこれらの製造方法 - Google Patents
マスクブランク、転写用マスクおよびこれらの製造方法 Download PDFInfo
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- WO2013140887A1 WO2013140887A1 PCT/JP2013/053053 JP2013053053W WO2013140887A1 WO 2013140887 A1 WO2013140887 A1 WO 2013140887A1 JP 2013053053 W JP2013053053 W JP 2013053053W WO 2013140887 A1 WO2013140887 A1 WO 2013140887A1
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- thin film
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- main surface
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/26—Phase shift masks [PSM]; PSM blanks; Preparation thereof
- G03F1/32—Attenuating PSM [att-PSM], e.g. halftone PSM or PSM having semi-transparent phase shift portion; Preparation thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/26—Phase shift masks [PSM]; PSM blanks; Preparation thereof
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/38—Masks having auxiliary features, e.g. special coatings or marks for alignment or testing; Preparation thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/54—Absorbers, e.g. of opaque materials
Definitions
- the present invention relates to a mask blank, a transfer mask, a manufacturing method thereof, and the like.
- phase shift film a halftone phase shift film made of MoSiN, MoSiON or the like.
- a phase shift film made of MoSiN, MoSiON or the like.
- a phase shift film it is common to form a phase shift film on the main surface of the translucent substrate using a single wafer sputtering apparatus.
- a rotary stage on which a light-transmitting substrate is placed is provided below a film forming chamber, and a target is arranged immediately above the rotary stage.
- the film thickness on the outer peripheral side of the main surface is the center because the main surface shape of the translucent substrate is rectangular.
- the phase shift film has a predetermined function between the function of transmitting the exposure light with a predetermined transmittance and the exposure light passing through the air by the same distance as the film thickness of the phase shift film with respect to the transmitted exposure light. A function for causing a phase difference is required at the same time.
- the thickness distribution in the plane of the formed phase shift film is uneven, there may be a variation in the transmittance distribution within the plane or a variation in the phase difference distribution within the plane.
- a material containing silicon is used as a target material, such as MoSiN or MoSiON, and when a phase shift film of a material containing oxygen or nitrogen is formed on a light-transmitting substrate by a DC sputtering method, Since nitride and silicon oxides have low conductivity, particles due to charge-up are likely to occur on the target surface. The particles may fall on the light-transmitting substrate directly below the target surface and enter the phase shift film to cause defects. That is, there is a problem that the defect occurrence rate is increased.
- Patent Document 1 In order to solve the peculiar problem that occurs when forming such a rectangular mask blank by sputtering, single-wafer sputtering as disclosed in Japanese Patent Application Laid-Open No. 2002-090978 (Patent Document 1).
- the device is in use.
- a target In this sputtering apparatus, a target is disposed obliquely above a rotary stage on which a translucent substrate is placed, and both a horizontal distance and a vertical distance are taken between the translucent substrate and the target (see FIG. 2).
- a sputtering apparatus having such a configuration (so-called oblique incidence sputtering system sputtering apparatus), the film thickness on the center side of the substrate becomes relatively thick. And defects due to charge-up on the target surface could be reduced.
- a thin film made of a metal and silicon-containing material such as MoSiN or MoSiON is light-resistant to exposure light irradiated to the mask when the transfer mask is produced from a mask blank having this thin film.
- a metal and silicon-containing material such as MoSiN or MoSiON
- the nature was not so high.
- the resistance to chemicals used in a process for producing a transfer mask from a mask blank and a cleaning liquid used in cleaning performed on the completed transfer mask is not so high.
- thin films of this material also tend to have a relatively large compressive stress.
- Patent Document 2 a glass substrate on which a light semi-transmissive film containing metal, silicon, and nitrogen is formed is used.
- heat treatment is performed.
- a thin film (such as a light semi-transmissive film) made of a material containing a transition metal, silicon, and nitrogen takes oxygen from the surface of the thin film when heated in air or in a gas containing oxygen.
- a layer (oxide layer) having a higher oxygen concentration than other regions is formed.
- This vertical furnace is provided with a quartz board inside the quartz tube.
- the plurality of mask blanks are arranged vertically at predetermined intervals inside the quartz tube.
- heat treatment is performed by a heater arranged on the outer periphery of the quartz tube.
- the heater is located on the end face side (outer peripheral side) with respect to the mask blank, heat from the heater is applied from the outer peripheral side of the mask blank.
- the mask blank is cooled by natural cooling after the heat treatment is completed, a large amount of residual heat from the quartz tube is applied to the outer peripheral side of the mask blank, which makes it difficult to cool.
- the present inventors have intensively studied a vertical furnace capable of performing the forced cooling treatment subsequent to the heat treatment.
- the configuration of the vertical furnace 100 as shown in FIG. 3 was found.
- the vertical furnace 100 shown in FIG. 3 is different from the vertical furnace disclosed in Patent Document 2 in that refrigerant is introduced into a space between the inner wall of the outer tube 10A and the outer wall of the inner tube 10B in the quartz tube 10 having a two-layer structure. This greatly differs in that it has a function (cooler) that can forcibly cool the inner tube 10B.
- the gas in the heating / cooling chamber 17 (inside the furnace) that is the internal space of the inner tube 10B and the mask blank 5 can be forcibly cooled.
- a refrigerant inflow pipe 11 and a refrigerant outflow pipe 12 are provided at the upper and lower portions of the outer pipe 10A to allow the refrigerant to flow into and out of the space.
- the vertical furnace 100 includes a gas inflow pipe 13 for flowing in and out of the gas (air, gas containing oxygen, etc.) exposed when the mask blank 5 is heat-treated into the heating / cooling chamber 17 and A gas outflow pipe 14 is provided.
- a heater (heater) 15 that is used when the mask blank 5 is heat-treated is provided on the outer periphery of the outer tube 10A.
- a quartz board 16 for placing a plurality of mask blanks 5 is installed in the furnace.
- a plurality of mask blanks 5 can be batch-processed and subjected to heat treatment and forced cooling treatment.
- the inner tube 10B of the quartz tube 10 is cooled by the refrigerant, and the gas in the heating and cooling chamber 17 is further cooled through the inner wall of the inner tube 10B. ing.
- the end surface side (outer peripheral side) of the mask blank (thin film) 5 is forcibly cooled.
- the thin film 4 is forcibly cooled in order from the end face side toward the center side.
- the thin film 4 takes in a large amount of oxygen when the surface temperature is not lower than a predetermined temperature. However, when the surface temperature of the thin film 4 rapidly decreases, the amount of oxygen taken in greatly decreases.
- FIG. 4 the cross section of the mask blank 5 after performing heat processing and forced cooling processing using the vertical furnace 100 is shown.
- This mask blank 5 uses a grazing incidence sputtering method sputtering apparatus as shown in FIG. 2 in the step of forming a thin film 4 made of a material containing a transition metal, silicon, and nitrogen on the translucent substrate 1.
- the thin film 4 is formed under the condition that the thin film has a high film thickness uniformity within the main surface. That is, the film thickness H c4 at the center (the area on the center side) of the thin film 4 and the film thickness H o4 at the outer periphery (the area on the outer periphery side) are substantially the same.
- the mask blank 5 is subjected to heat treatment and forced cooling treatment in the vertical furnace 100 after the thin film 4 is formed.
- the thickness of the oxide layer 42 is relatively thin at the outer peripheral portion of the thin film 4, and the thickness of the oxide layer 42 is relatively thick at the central portion of the thin film (
- the region 41 of the thin film 4 excluding the oxide layer 42 is relatively thick at the outer peripheral portion and relatively thin at the central portion. That is, the region 41 of the thin film 4 except thickness H c 42 of the oxide layer 42 of the central portion of the thick (oxide layer 42 than the thickness H O 42 oxide layer 42 of the peripheral portion, the thickness H c41 central portion outer periphery
- the thickness is smaller than the thickness H o41 of the part).
- one side with respect to the center of the translucent substrate 1 defines a quadrangle having a predetermined length, an inner region of the quadrangle is a central portion, and an outer region of the quadrangle is an outer peripheral portion.
- the side of the translucent substrate having a square shape of about 152 mm which is the size of a mask blank widely used in the past, is preferably set to 132 mm, for example.
- the length of one side of the square is not limited to this.
- the shape of the boundary line between the central portion and the outer peripheral portion is not limited to a quadrangle.
- the thin film 4 provided on the translucent substrate 1 in the mask blank 5 is as uniform as possible on the main surface. It has also been desired that the film composition of the thin film 4 be as uniform as possible within the main surface. And the conditions of the film-forming apparatus which forms the thin film 4 were set and the thin film formation process was performed so that it might become closer to distribution of uniform film thickness and distribution of uniform film composition. For this reason, the thin film 4 before the heat treatment and the forced cooling treatment has high uniformity of transmittance distribution within the main surface.
- the oxide layer 42 formed on the surface layer of the thin film 4 after performing the heat treatment and the forced cooling treatment is a material having a significantly higher transmittance than the material of the thin film in the region 41 excluding the oxide layer 42.
- the uniformity of the film thickness distribution of the oxide layer 42 is low, so the uniformity of the in-plane distribution of the transmittance of the entire thin film 4 is also low (in-plane variation becomes large). I'm stuck).
- the thin film 4 is a phase shift film not only having a predetermined transmittance but also having a function of causing a predetermined amount of phase shift to the transmitted exposure light
- the distribution of the phase shift amount in the main surface In particular, high uniformity is required. For this reason, it becomes a problem especially when the thin film 4 is a phase shift film.
- a transfer mask produced from the mask blank 5 having the thin film 4 has a problem because the exposure light irradiated to the mask is an ArF excimer laser having a short wavelength, and the influence appears remarkably.
- the present inventors conducted extensive research. First, when performing batch-type heat treatment and forced cooling treatment using a vertical furnace 100 on a plurality of mask blank thin films, the thickness distribution of the oxide layer formed on the surface layer of the thin film is made uniform. It turned out to be difficult. Therefore, the inventors have assumed that the thickness distribution of the oxide layer is thick at the center of the main surface and thin at the outer periphery, and the transmittance distribution of the thin film after the oxide layer is formed becomes uniform. Thus, it tried to adjust in the stage of a thin film formation process. First, the present inventors diligently studied the film forming conditions in which the film composition of the thin film has a low transmittance at the central portion and a high transmittance at the outer peripheral portion.
- the present invention has been made as a result of the above-described diligent research by the present inventors, and has the following configuration.
- (Configuration 1) On the main surface of the translucent substrate, a mask blank provided with a thin film for forming a transfer pattern, The thin film comprises a material containing a transition metal and silicon, and further containing at least one of oxygen and nitrogen, The thin film has an oxide layer having a higher oxygen content than a thin film in a region excluding the surface layer on the surface layer, The thin film is formed such that the thickness of the central part is thicker than the thickness of the outer peripheral part on the main surface side, The mask blank, wherein the oxide layer is formed such that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side.
- a method for manufacturing a mask blank having a thin film for forming a transfer pattern on a main surface of a translucent substrate On the main surface of the translucent substrate, using a target containing a transition metal and silicon, a thin film forming step of forming the thin film by a sputtering method in a sputtering gas containing at least one of oxygen and nitrogen, A heating and cooling treatment step for performing a heat treatment and a forced cooling treatment in a gas containing oxygen on the thin film formed in the thin film formation step;
- the thin film forming step is a step of forming the thin film so that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side
- the heating and cooling treatment step is a step of forming an oxide layer having a higher oxygen content than the thin film in a region excluding the surface layer on the surface layer of the thin film, and the oxide layer is made thicker than the thickness of the outer peripheral portion on the main surface side.
- a method for manufacturing a mask blank which is a
- (Configuration 7) In the heating and cooling treatment step, a plurality of the translucent substrates on which the thin film is formed are arranged in a heating and cooling chamber in a vertically stacked manner with the main surface being the vertical direction and spaced apart from each other.
- the heating and cooling treatment step is a step of performing a forced cooling treatment by a cooler after the heating treatment by the heater and when the temperature in the heating and cooling chamber is 300 ° C. or higher. 8.
- the translucent substrate is rotated by a rotation axis passing through the center of the main surface, the sputtering surface of the sputtering target is opposed to the main surface of the translucent substrate, and is made with respect to the main surface. It is a position having an angle, and is arranged at a position where a rotation axis of the translucent substrate and a straight line passing through the center of the sputtering surface and parallel to the rotation axis of the translucent substrate are shifted by a sputtering method.
- (Configuration 10) 10. The method for manufacturing a mask blank according to any one of configurations 6 to 9, wherein the thin film is a semi-transmissive film having a transmittance of 1% or more with respect to exposure light.
- the thin film has a transmittance of 1% or more with respect to exposure light, and is positioned between the exposure light transmitted through the thin film and the exposure light passed through the air by the same distance as the film thickness of the thin film. 10.
- (Configuration 12) 12 12. The method of manufacturing a mask blank according to Configuration 10 or 11, wherein the thin film has an in-plane distribution of the transmittance within a range of 0.6%.
- the optical characteristics such as transmittance of the entire thin film can be within a predetermined tolerance.
- the main surface of the optical characteristics such as transmittance in the entire thin film including the surface layer is included. It is possible to keep the uniformity at a predetermined tolerance.
- the mask blank of the present invention is a mask blank provided with a thin film for forming a transfer pattern on the main surface of a translucent substrate, as in Configuration 1.
- the thin film comprises a material containing a transition metal and silicon, and further containing at least one of oxygen and nitrogen,
- the thin film has an oxide layer having a higher oxygen content than a thin film in a region excluding the surface layer on the surface layer,
- the thin film is formed such that the thickness of the central part is thicker than the thickness of the outer peripheral part on the main surface side,
- the oxide layer is characterized in that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side.
- the manufacturing method of the mask blank of this invention is a manufacturing method of the mask blank provided with the thin film for transfer pattern formation on the main surface of a translucent board
- a thin film forming step of forming the thin film by a sputtering method in a sputtering gas containing at least one of oxygen and nitrogen On the main surface of the translucent substrate, using a target containing a transition metal and silicon, a thin film forming step of forming the thin film by a sputtering method in a sputtering gas containing at least one of oxygen and nitrogen,
- the thin film forming step is a step of forming the thin film so that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side
- the heating and cooling treatment step is a step of forming an oxide layer having a higher oxygen
- the thin film has an oxide layer having a higher oxygen content than a thin film in a region excluding the surface layer.
- the mask blank 3 has a configuration in which a transfer pattern forming thin film 2 is provided on the main surface of a translucent substrate 1, and the thin film 2 has a surface layer excluding the surface layer.
- the oxide layer 22 has a higher oxygen content than the thin film 21.
- the thin film 2 is formed such that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side.
- the thin film 2 is formed such that the thickness H c2 of the central portion is thicker than the thickness H o2 of the outer peripheral portion on the main surface side. Specifically, the thickness of the thin film 2 increases from the outer peripheral portion to the central portion of the thin film 2.
- a square with a predetermined length is defined on one side with respect to the center of the translucent substrate 1, an inner region of the quadrangle is a central portion, and an outer region of the quadrangle is an outer peripheral portion. It is said.
- the length of one side of the square may be set to 132 mm or 142 mm, for example. Note that the length of one side of the square is not limited to this.
- the shape of the boundary line between the central portion and the outer peripheral portion is not limited to a quadrangle.
- the thickness H c2 of the central portion of the thin film 2 is preferably a film thickness measured at the center of the central portion of the thin film 2.
- the thickness H o2 of the outer peripheral portion of the thin film 2 is preferably a thickness measured in the vicinity of the boundary line with the inner peripheral portion in the outer peripheral portion of the thin film 2.
- the thickness H o2 of the outer peripheral portion of the thin film 2 is more preferably a film thickness measured at the outer peripheral portion of the thin film 2 in the vicinity of the corner portion of the quadrilateral. .
- the oxide layer 22 is formed such that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side. As shown in FIG. 1, oxide layer 22 is formed thick thickness H c22 of the central portion than the thickness H o22 of the outer peripheral portion of the main surface. Specifically, the thickness of the oxide layer 22 increases from the outer peripheral portion of the thin film 2 toward the central portion.
- the thickness H c22 of the central portion of the oxide layer 22 is preferably a film thickness measured at the center on the main surface side of the thin film 2.
- the thickness Ho 22 of the outer peripheral portion of the oxide layer 22 is preferably a film thickness measured in the vicinity of the boundary line with the inner peripheral portion of the outer peripheral portion of the oxide layer 22.
- the thickness Ho22 of the outer peripheral portion of the oxide layer 22 is a film thickness measured at the outer peripheral portion of the thin film 2 in the vicinity of the corner of the quadrilateral. preferable.
- the film thicknesses of the outer peripheral part and the central part on the main surface side of the thin film 2 and the film thicknesses of the outer peripheral part and the central part on the main surface side of the oxide layer 22 are obtained after the transfer mask is produced from the mask blank 3.
- the optical characteristics (transmittance to exposure light, phase shift amount to be given to exposure light, etc.) required for the thin film (thin film pattern) on which the transfer pattern is formed are determined.
- the in-plane distribution of the thickness of the oxide layer 22 formed on the thin film 2 (the thickness H of the outer peripheral portion on the main surface side of the oxide layer 22).
- the film thickness distribution (the film thickness H o2 at the outer peripheral portion on the main surface side of the thin film and the film thickness H c2 at the central portion) is determined.
- the thin film 2 for forming a transfer pattern in the present invention contains a transition metal M and silicon (Si), and is made of a material containing at least one of oxygen (O) and nitrogen (N).
- the oxide layer 22 formed on the surface layer of the thin film 2 made of these materials tends to be a layer having a high content of silicon and oxygen.
- Such an oxide layer 22 has a higher transmittance (a smaller extinction coefficient k of the material) than the thin film portion 21 other than the oxide layer 22, and a smaller amount of phase shift caused to the transmitted exposure light. (The refractive index n of the material is reduced).
- the oxide layer 22 slightly attenuates the transmitted exposure light and slightly shifts the phase of the transmitted exposure light.
- the film thickness distribution of the thin film 2 to be formed first on the translucent substrate 1 is the film thickness distribution of the oxide layer 22 formed on the surface layer of the thin film 2 in the subsequent process and the oxide layer 22 has a transmittance. It is necessary to make a determination in consideration of the influence on the phase shift amount.
- the film thickness H c21 at the central portion in the region 21 of the thin film 2 excluding the oxide layer 22 is smaller than the film thickness Ho 21 at the outer peripheral portion in the region 21.
- the oxide layer 22 does not include those formed by natural oxidation or use in the form of a transfer mask (long exposure light exposure).
- the oxidation layer (hereinafter referred to as an oxidation layer by natural oxidation or the like) that is formed into a thin film pattern while being used in the form of a natural oxidation of the thin film 2 or a transfer mask has a tendency that the oxidation of the surface layer proceeds uniformly. strong. For this reason, the uniformity of the film thickness of the formed surface layer is relatively high, and it is difficult to become the oxide layer 22 having the film thickness distribution as in the inventions according to the first and sixth structures.
- the thin film is configured as in the present invention, the in-plane variation of the optical characteristics may be increased.
- the ratio of the thickness H c2 at the central portion and the thickness H o2 at the outer peripheral portion is generally related to the composition of the thin film 2, the transmittance of the thin film 2, the film thickness of the thin film 2, and the like.
- the thickness of the oxide layer 22 is preferably 4 nm or less, and more preferably 3 nm or less, even at the thickest portion (center portion).
- the transfer pattern forming thin film 2 includes a transition metal M and silicon (Si), and further includes at least one of oxygen (O) and nitrogen (N).
- Transition metals M include molybdenum (Mo), tantalum (Ta), tungsten (W), titanium (Ti), chromium (Cr), hafnium (Hf), nickel (Ni), vanadium (V), zirconium (Zr). , Ruthenium (Ru), rhodium (Rh), niobium (Nb), palladium (Pb), etc., or an alloy thereof.
- the thin film 2 for forming the transfer pattern includes a case made of a material containing carbon, hydrogen, an inert gas (helium, argon, xenon, etc.) in addition to the above components.
- the transfer pattern forming thin film 2 includes transition metal silicide, transition metal silicide nitride, transition metal silicide nitride oxide, transition metal silicide oxide, and the like.
- the thin film 2 includes a single layer structure and a multilayer structure.
- the thin film 2 may include an antireflection layer.
- the thin film 2 includes a composition gradient film.
- the thin film 2 includes a semipermeable membrane.
- the semi-permeable membrane includes a single layer structure, a two-layer structure composed of a low transmittance layer and a high transmittance layer, and a multilayer structure.
- the semi-permeable membrane includes a high transmittance type.
- the high transmittance type means, for example, a material having a relatively high transmittance of 10 to 30% with respect to a normal transmittance of 1 to less than 10%.
- the thin film 2 can be a semi-transmissive film in a phase shift mask or an enhancer mask, or a light shielding film in a binary mask.
- the light shielding film of the binary mask is also required to reduce the phase difference from the viewpoint of the EMF bias. For example, when the in-plane distribution of the phase difference is strictly asked, there is an effect of applying the present invention.
- the transition metal is preferably molybdenum.
- the thin film 2 made of a material such as MoSiN or MoSiON tends to have a relatively large compressive stress, and heat treatment is effective for reducing the compressive stress, and the subject of the present application is particularly remarkable. Because.
- the transfer pattern forming thin film 2 include molybdenum silicide (MoSi), molybdenum silicide nitride (MoSiN), molybdenum silicide nitride oxide (MoSiNO), molybdenum silicide oxide (MoSiO), and molybdenum silicide nitride carbide (MoSiCN). ), Molybdenum silicide oxycarbide (MoSiOC), molybdenum silicide oxynitride carbide (MoSiOCN), and the like.
- the oxide layer 22 may be formed in the course of a heating / cooling process in which the thin film 2 is subjected to a heating process and a forced cooling process in a gas containing oxygen. preferable. This is because the thin film 2 heated by the heat treatment is rapidly cooled by forced cooling, so that the degree of in-plane variation of the oxygen uptake amount in the thin film surface layer can be easily controlled.
- the oxide layer 22 is preferably formed by a heating / cooling process as shown in Configuration 6.
- the mask blank 3 having the thin film 2 is subjected to a heating process in a gas containing oxygen, and a forced cooling process in which the mask blank 3 is forcibly cooled before being naturally cooled.
- the oxide layer 22 formed by the heating and cooling treatment step becomes a film having a higher degree of oxidation when the heating temperature at the time of the heating treatment is higher, and resistance to the cleaning liquid used in the cleaning treatment at the time of manufacturing the mask blank, from this mask blank. Resistance to the cleaning liquid used in the process of manufacturing the transfer mask and resistance to the cleaning liquid when cleaning the transfer mask are increased.
- the heat processing to the thin film 2 has preferable heating temperature of 400 degreeC or more, More preferably, it is 450 degreeC or more.
- the heating temperature of the heat treatment for the thin film 2 is desirably 900 ° C. or lower in consideration of the influence on the light-transmitting substrate 1.
- the translucent substrate 1 is vertically arranged with the main surface in the vertical direction and spaced apart from each other, outside the heating and cooling chamber, and a heater on the end surface side (outer peripheral side) of the translucent substrate 1 It is preferable to arrange a cooler and perform heat treatment and forced cooling treatment.
- An example of a heating / cooling apparatus that realizes this process is a vertical furnace 100 shown in FIG. 3. In the vertical furnace 100, the space inside the inner tube 10 ⁇ / b> B of the quartz tube 10 is a heating / cooling chamber 17.
- a quartz board 16 (a shelf made of quartz) is arranged in the heating / cooling chamber 17.
- the quartz board 16 is provided with a substrate support portion 16A so that the translucent substrate 1 (mask blank 3) on which the thin film 2 is formed can be arranged with the main surfaces facing each other spaced apart from each other. ing.
- a gas inflow pipe 13 and a gas outflow pipe 14 are connected to the heating / cooling chamber 17.
- a gas (air or the like) containing oxygen is caused to flow in from the gas inflow pipe 13 and out of the gas outflow pipe 14 so that the gas in the heat treatment chamber 17 is always replaced.
- the quartz tube 10 has a double tube structure of an outer tube 10A and an inner tube 10B.
- a refrigerant inflow pipe 11 and a refrigerant outflow pipe 12 are connected to the outer pipe 10A.
- the refrigerant inflow pipe 11 and the refrigerant outflow pipe 12 are sandwiched between the inner wall of the outer pipe 10A and the outer wall of the inner pipe 10B, so that the refrigerant flows into and out of the space, so that the heating / cooling chamber 17 that is the inner space of the inner pipe 10B is formed. It can be forced to cool. That is, the cooler is constituted by the quartz tube 10, the refrigerant inflow pipe 11, the refrigerant outflow pipe 12, and a refrigerant supply source (not shown).
- the forced cooling process is performed from the outer peripheral side of the mask blank 3.
- a heater 15 is provided as a heater on the outer periphery of the outer tube 10A.
- the heat treatment is also performed from the outer peripheral side of the mask blank 3.
- the forced cooling process in the heating and cooling process be performed at least before the thin film 2 of the mask blank 3 being heated falls to a temperature at which large variations occur in the formation of the oxide layer 22 due to natural cooling.
- the forced cooling process by the cooler is performed after the heating process by the heater and when the temperature in the heating and cooling chamber 17 is 300 ° C. or higher. It is desirable that the process be performed.
- the term “after the heat treatment” is not limited to immediately after stopping the heater that is the heat source of the heat treatment, but includes a step of starting forced cooling by the cooler immediately before stopping the heater.
- the heating process and the forced cooling process for the thin film 2 are preferably an arrangement of a heater and a cooler in which the heating and cooling proceed from the outer peripheral part to the central part of the thin film 2.
- forced cooling treatment is performed after reaching a temperature (about 300 ° C.) at which the rate of taking oxygen into the film is significantly increased compared to natural oxidation in the heat treatment.
- the time until the surface temperature of the thin film 2 is lowered to a temperature at which the rate of taking oxygen into the film is significantly lowered can be made longer in the central portion than in the outer peripheral portion of the thin film 2.
- the thickness of the oxide layer 22 formed on the surface layer of the thin film 2 can be made thicker at the central portion than at the outer peripheral portion on the main surface side.
- oxygen is surrounded around the thin film 2 of the mask blank 3.
- the gas to be contained must be present.
- the gas containing oxygen may be air, but dry air that has passed through a chemical filter is preferable.
- the thin film forming step sputtering is performed in a sputtering gas containing at least one of oxygen and nitrogen using a target containing a transition metal and silicon on the main surface of the translucent substrate 1 as shown in Configuration 6.
- the step of forming the thin film 2 by a method is preferable. Since it is desired that the uniformity of the film composition on the main surface side of the thin film 2 before the heating and cooling treatment step is desired, it is preferable to form the thin film 2 using a single wafer sputtering apparatus.
- the thin film 2 in the present invention needs to control the film thickness distribution on the main surface side, but the film thickness distribution is not uniform, and conversely, the film thickness of the outer peripheral portion is relatively thin. For this reason, it is also possible to use a single-wafer sputtering apparatus having a configuration in which a target surface is disposed directly above the main surface on the side where the thin film 2 of the translucent substrate 1 is formed.
- the thin film forming step is performed by using the translucent substrate 1 as the center of the main surface as in the configuration 9.
- the sputter surface of the sputtering target is opposed to the main surface of the translucent substrate 1 and has an angle with respect to the main surface, and the translucent substrate 1 is rotated.
- the thin film 2 is formed by a sputtering method by disposing the axis and a straight line passing through the center of the sputtering surface and parallel to the rotation axis of the translucent substrate 1.
- the thin film forming step is preferably performed while rotating the translucent substrate 1. This is because the film thickness of the thin film 2 is uniformly formed as compared with the case where the translucent substrate 1 is not rotated.
- a method for forming the thin film 2 a DC sputtering method, an RF sputtering method, or an ion beam sputtering method can be applied.
- the thin film forming step is preferably a DC sputtering method. This is because the deposition rate is high and the mass productivity is excellent.
- examples of the thin film 2 include a semi-transmissive film having a transmittance of 1% or more with respect to exposure light, such as Structure 2 and Structure 10.
- a semi-transmissive film for example, a phase difference effect that causes a phase shift effect cannot be obtained with a semi-transmissive film with no phase difference for producing an enhancer mask or a semi-transmissive film alone.
- examples thereof include a semi-transmissive film for producing a phase shift mask capable of obtaining a phase difference that causes a phase shift effect by digging a predetermined depth from the substrate surface.
- the transmittance of the thin film 2 with respect to the exposure light is 30% or less.
- the exposure light having a transmittance of 1% or more with respect to the exposure light as in the structures 3 and 11, and the film of the thin film 2 and the film of the thin film 2 are transmitted.
- Examples include a halftone phase shift film that can obtain a predetermined phase difference that causes a phase shift effect between the exposure light that has passed through the air by the same distance as the thickness.
- the transmittance of the thin film 2 with respect to exposure light is preferably 30% or less.
- the phase difference generated when the exposure light passes through the thin film 2 is preferably in the range of 160 degrees to 200 degrees, and in the range of 170 degrees to 190 degrees. More preferably.
- the film thickness is preferably 65 nm or less, and more preferably 55 nm or less.
- the film thickness is preferably 75 nm or less, and more preferably 70 nm or less.
- the film thickness is preferably 40 nm or less, and more preferably 30 nm or less.
- the thin film 2 has an in-plane distribution of the transmittance within a range of 0.6% as shown in the configuration 4 and the configuration 12.
- the transmittance at various points in the plane is within the range of + 0.6% with respect to the target value of the transmittance
- the transmittance is within the range of -0.6%
- the surface with respect to the target value of the transmittance If the maximum value and the minimum value of the transmittance at each point are within a range of ⁇ 0.3%, the in-plane distribution of the transmittance is within a range of 0.6%.
- the thin film 2 has a transmittance (maximum value and minimum value of the transmittance) at various points in the plane within a range of ⁇ 0.3% with respect to the target value of the transmittance.
- the thin film 2 has an in-plane distribution of the phase difference within a range of 4 degrees as shown in configurations 5 and 13.
- the phase difference at various points in the plane with respect to the target value of the phase difference is within the range of +4 degrees, or within the range of -4 degrees
- the position of the various points within the plane with respect to the target value of the phase difference If the maximum value and the minimum value of the phase difference are within a range of ⁇ 2 degrees, the in-plane distribution of the phase difference is within a range of 4 degrees.
- the thin film 2 has a phase difference (maximum value and minimum value of the phase difference) in a range of ⁇ 2 degrees with respect to the target value of the phase difference.
- the transfer mask of the present invention is characterized in that a transfer pattern is formed on the thin film 2 of the mask blank 3 according to any one of Configurations 1 to 5.
- the transfer mask manufacturing method of the present invention forms a transfer pattern on the thin film 2 of the mask blank 3 manufactured by the mask blank manufacturing method according to any one of Configurations 6 to 13. It has the formation process.
- the resist formed on the thin film 2 of the mask blank 3 is preferably a chemically amplified resist. This is because it is suitable for high-precision processing.
- the resist is preferably an electron beam drawing resist. This is because it is suitable for high-precision processing.
- the present invention is applied to a mask blank for electron beam drawing in which a resist pattern is formed by electron beam drawing.
- substrate 1 will not be restrict
- a quartz substrate and other various glass substrates for example, CaF 2 substrate, soda lime glass, non-alkali glass substrate, aluminosilicate glass, etc.
- the substrate is particularly suitable for the present invention because of its high transparency in the wavelength region of ArF excimer laser.
- the transfer mask includes a phase shift mask and a binary mask that does not use the phase shift effect.
- the transfer mask includes a reticle.
- the phase shift mask includes a phase shift mask such as a halftone type (tritone type) and an enhancer mask.
- the material of the semi-transmissive film includes a transition metal silicide. Chrome (having etching resistance) or a chromium compound in which elements such as oxygen, nitrogen, and carbon are added to chromium.
- the light shielding film pattern can be formed on or below the light semi-transmissive film pattern.
- the chromium-containing material includes chromium (Cr), chromium (Cr), nitrogen (N), oxygen (O), carbon (C), hydrogen (H), helium (He), and other elements. Materials containing one or more are included. For example, Cr, CrN, CrO, CrNO, CrNC, CrCON, etc., and materials containing hydrogen (H) and helium (He) in addition to these are included.
- the dry etching of the thin film 2 containing a transition metal and silicon includes, for example, fluorine-based gases such as SF 6 , CF 4 , C 2 F 6 , CHF 3 , and these, and He, H 2 , N 2 , Ar , C 2 H 4 , O 2, or other mixed gas can be used.
- fluorine-based gases such as SF 6 , CF 4 , C 2 F 6 , CHF 3 , and these, and He, H 2 , N 2 , Ar , C 2 H 4 , O 2, or other mixed gas can be used.
- a dry etching gas composed of a mixed gas containing a chlorine-based gas and an oxygen gas can be used.
- the chlorine-based gas used for dry etching include Cl 2 , SiCl 4 , HCl, CCl 4 , and CHCl 3 .
- the transfer pattern forming thin film 2 provided on the translucent substrate 1 contains a transition metal and silicon, and further contains at least one of oxygen and nitrogen. It is formed.
- the material comprising silicon and nitrogen, or the material comprising one or more elements selected from a metalloid element, a non-metal element and a rare gas in the material comprising silicon and nitrogen is used as the thin film 2 for pattern formation of the present invention. Even when used as the material to be formed, the configuration of the pattern forming thin film 2 of the present invention can be applied, and the same effect can be obtained.
- the mask blank 3 includes a thin film 2 for forming a transfer pattern on the main surface of the translucent substrate 1, and the thin film 2 is made of silicon and nitrogen, or silicon.
- the material made of nitrogen is made of a material containing one or more elements selected from a metalloid element, a non-metal element, and a rare gas, and the thin film 2 has an oxygen content higher than that of the thin film in the region 21 excluding the surface layer.
- the thin film 2 is formed such that the thickness of the central portion is thicker than the thickness of the outer peripheral portion on the main surface side, and the oxide layer 22 has the thickness of the outer peripheral portion on the main surface side. This is a mask blank 3 having a thicker central portion than that.
- the transfer pattern forming thin film 2 of the present invention containing a transition metal which is an element having a high refractive index and extinction coefficient is not as large.
- the film thickness distribution of the oxide layer formed on the surface layer of the thin film by the heating and cooling process is not uniform, the uniformity of the transmittance distribution and the phase shift amount distribution in the entire thin film is deteriorated. Therefore, even in the case of a transfer pattern forming thin film to which a material composed of silicon and nitrogen is applied, the transmittance of the entire thin film can be obtained by adopting the thicknesses of the thin film 2 and the oxide layer 22 as defined in the present invention. The uniformity of the distribution and the distribution of the phase shift amount can be improved.
- the thin film forming step is performed using a silicon target or a target made of a material containing one or more elements selected from a semi-metal element and a non-metal element in silicon. Even when the thin film 2 is formed by a sputtering method in a sputtering gas containing a gas and a rare gas, the same effect as that obtained by the mask blank manufacturing method of the present invention can be obtained.
- the thin film 2 is formed by a sputtering method in a sputtering gas containing a nitrogen-based gas and a rare gas, using a silicon target or a target made of a material containing one or more elements selected from metalloid and nonmetal elements.
- the heating and cooling treatment step excludes the surface layer from the surface layer of the thin film 2.
- This is a step of forming the oxide layer 22 having a higher oxygen content than the thin film 2 in the region 21, and the oxide layer 22 is formed so that the thickness of the central portion is larger than the thickness of the outer peripheral portion on the main surface side. It is the manufacturing method of the mask blank which is a process.
- the metalloid element contained in the thin film 2 is not particularly limited.
- metalloid elements when one or more elements selected from boron, germanium, antimony and tellurium are included, silicon used as a sputtering target can contain these metalloid elements, and the conductivity of the target can be increased. It is preferable because it can be expected to increase. Any sputtering method can be applied in the thin film forming step in the mask blank manufacturing method. Since the conductivity of the target is lower than that of a thin film containing a transition metal, it is more preferable to apply an RF sputtering method or an ion beam sputtering method.
- the thin film 2 may contain any nonmetallic element. Among nonmetallic elements, it is preferable to contain one or more elements selected from carbon, fluorine and hydrogen.
- the nitrogen-based gas used in the thin film forming step any gas can be applied as long as it contains nitrogen. Since it is preferable to keep the oxygen content low in the thin film 2 before the oxide layer 22 is formed, it is preferable to apply a nitrogen-based gas not containing oxygen, and more preferable to apply nitrogen gas.
- Any rare gas can be used as the rare gas used in the thin film formation step, but it is preferable to use argon, krypton, or xenon in consideration of the film formation rate. In consideration of relieving the stress of the thin film 2 to be formed, it is preferable to apply helium and neon having a small atomic weight so that the thin film 2 is actively incorporated.
- the manufacturing method of the said mask blank which has the thin film formed with the material which does not contain a transition metal, and its mask blank
- the manufacturing method of the mask blank 3 of this invention or the mask blank 3 of this invention It is the same as the case of.
- the transfer mask produced using the mask blank having the thin film formed of a material not containing a transition metal and the method for producing the transfer mask the transfer mask of the invention and the transfer mask of the invention are also used. This is the same as the manufacturing method of the transfer mask.
- Example 1 As the translucent substrate 1, a synthetic quartz glass substrate having a main surface of a square of about 152 mm ⁇ about 152 mm and a thickness of about 6.25 mm is used. Molybdenum, silicon, and nitrogen are formed on the translucent substrate 1. A semi-permeable membrane (thin film) 2 was formed. For the formation of the semi-transmissive film 2, a so-called oblique incident sputtering type and single wafer processing type DC sputtering apparatus shown in FIG. 2 was used.
- the film forming conditions (T of the DC sputtering apparatus) are set so that the average thickness of the semi-transmissive film 2 to be formed is 69 nm and the thickness of the central portion is about 18 mm thicker than the thickness of the outer peripheral portion. / S distance, offset distance, sputtering conditions).
- the boundary between the central portion and the outer peripheral portion of the thin film 2 to be formed was a quadrangular shape having a side of 132 mm with respect to the center of the synthetic quartz glass substrate 1. Moreover, the area
- the phase shift film 2 (phase shift film when the mask blank 3 is completed) 2 after the formation of the oxide layer 22 has an ArF excimer laser transmittance of 6% for exposure light having a wavelength of 193 nm and a phase.
- the film forming conditions were set so that the shift amount was 177 degrees.
- the wavelength of the ArF excimer laser is measured with a phase shift amount measuring device (MPM193 manufactured by Lasertec Corporation) with respect to the central portion of the thin film 2 (center of the main surface of the translucent substrate).
- MPM193 manufactured by Lasertec Corporation
- the transmittance and phase shift amount with respect to light having a wavelength of 193 nm were measured, the transmittance was 4.52% and the phase shift amount was 182.5 degrees.
- the film thickness at the center of the main surface of the translucent substrate 1 as measured at the center of the phase shift film 2 by the X-ray reflectivity method (XRR) was 702 mm.
- the film thickness of each outer peripheral part in the vicinity of the four corners in the boundary rectangle was measured by the X-ray reflectivity method (XRR), and the average value was calculated. Met.
- XRR X-ray reflectivity method
- the translucent substrate 1 on which five MoSiN films (phase shift films) 2 prepared in the same procedure are formed is applied to the substrate support portion 16A of each stage of the quartz board 16 of the vertical furnace 100 of FIG. They were placed in a vertical stack at intervals.
- a translucent substrate (dummy substrate) on which the phase shift film 2 was not formed was placed on the uppermost and lowermost substrate support portions 16A of the quartz board 16. This is because the uppermost stage and the lowermost stage are easily affected by disturbances and the like, and it is difficult to control the thickness of the oxide layer 22.
- the heat treatment for the thin film 2 was performed for 1 hour after the temperature in the heating / cooling chamber 17 reached 450 ° C. after the heating by the heater 15 was started.
- the transmittance and phase shift amount for light having a wavelength of 193 nm were measured in the same manner for five light-transmitting substrates provided with the phase shift film 2 after the forced cooling treatment.
- the average transmittance was 6.16% and the average phase shift amount was 178.1 degrees.
- the transmittance and the phase shift amount were similarly measured at the four outer peripheral portions where the film thickness was measured before the formation of the oxide layer 22 as the outer peripheral portion of the phase shift film, and the average value of the transmittance and the phase shift were measured. The average amount was calculated.
- the average transmittance at the outer peripheral portion of the phase shift film 2 was 6.07%, and the average phase shift amount was 177.3.
- the translucent substrate 1 provided with the five phase-shifted films 2 after forced cooling treatment has a measured value of transmittance of ⁇ 0.3% from 6% of the designed transmittance in both the central portion and outer peripheral portion of the thin film. It was within the range of%.
- the measured value of the phase shift amount was within the range of 177 degrees to ⁇ 2 degrees of the design phase shift amount in both the central portion and the outer peripheral portion of the phase shift film 2.
- the film thickness of the oxide layer 22 was measured using the X-ray reflectivity method (XRR) with respect to the translucent board
- XRR X-ray reflectivity method
- Example 1 Similarly to Example 1, a translucent film (thin film) 4 made of molybdenum, silicon, and nitrogen was formed on the translucent substrate 1.
- a translucent film (thin film) 4 made of molybdenum, silicon, and nitrogen was formed on the translucent substrate 1.
- the MoSiN film (phase shift film) 4 formed on the translucent substrate 1 has a film thickness difference of about 5 mm between the outer peripheral portion and the central portion, which is significantly smaller than that of Example 1.
- Five translucent substrates 1 on which the MoSiN film (phase shift film) 4 of Comparative Example 1 was formed were prepared in the same procedure.
- the transmittance and phase shift amount for light having a wavelength of 193 nm were measured in the same manner for five light-transmitting substrates provided with the phase shift film 4 after the forced cooling treatment.
- the measurement result of the central portion of the thin film 4 (the center of the main surface of the light-transmitting substrate 1) was a transmittance of 6.44% and a phase shift amount of 174.3 degrees.
- the transmittance and the phase shift amount are similarly measured at the four outer peripheral portions where the film thickness is measured before the formation of the oxide layer 42 which is the outer peripheral portion of the phase shift film 4, and the average value and phase of the transmittance are measured. The average value of the shift amount was calculated.
- the average transmittance at the outer periphery of the phase shift film 4 was 5.72%, and the average phase shift amount was 180.1.
- the translucent substrate 1 having the five phase-shifted films 4 after forced cooling treatment has a measured transmittance of 6% from the design transmittance of ⁇ 0. It was out of the range of 3%.
- the measured value of the phase shift amount is outside the range of ⁇ 2 degrees from the design phase shift amount of 177 degrees in both the central portion and the outer peripheral portion of the phase shift film 4. .
- a light shielding film made of a material containing chromium was formed on the phase shift film 2 of the phase shift mask blank 3 manufactured in Example 1 to prepare a phase shift mask blank having the light shielding film.
- the formed light shielding film has a structure in which a CrCON film (thickness 30 nm), a CrN film (thickness 4 nm), and a CrOCN film (thickness 14 nm) are sequentially laminated from the phase shift film 2 side.
- the optical density with respect to the wavelength (193 nm) of the ArF excimer laser was 3.1.
- a halftone phase shift mask was produced using the produced phase shift mask blank having a light shielding film. Specifically, first, a chemically amplified positive resist film for electron beam drawing (PRL009 manufactured by Fuji Film Electronics Materials) was formed as a resist film on the light shielding film of the mask blank. The resist film was formed by spin coating using a spinner (rotary coating apparatus).
- PRL009 manufactured by Fuji Film Electronics Materials
- a transfer pattern to be formed on the phase shift film is drawn on the resist film formed on the mask blank using an electron beam drawing apparatus, and then developed with a predetermined developer to form a resist pattern. did.
- the resist pattern as a mask
- the light shielding film was etched to form a light shielding film pattern.
- a mixed gas of Cl 2 and O 2 was used as a dry etching gas.
- the phase shift film was etched to form a phase shift pattern.
- a mixed gas of SF 6 and He was used as the dry etching gas.
- the remaining resist pattern was removed, and a chemically amplified positive resist film for electron beam drawing (PRL009 manufactured by Fuji Film Electronics Materials) was newly formed by spin coating. Further, after drawing a transfer pattern (light shielding band or the like) to be formed on the light shielding film using an electron beam drawing apparatus on the formed resist film, the resist film was developed with a predetermined developer to form a resist pattern.
- PRL009 manufactured by Fuji Film Electronics Materials
- phase shift mask has high in-plane uniformity of the transmittance and phase difference of the phase shift pattern, and can perform exposure transfer with high accuracy.
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Abstract
Description
(構成1)
透光性基板の主表面上に、転写パターン形成用の薄膜を備えたマスクブランクであって、
前記薄膜は、遷移金属とケイ素を含有し、さらに酸素または窒素のうち少なくともいずれかを含有する材料からなり、
前記薄膜は、その表層に前記表層を除く領域の薄膜よりも酸素含有量が多い酸化層を有し、
前記薄膜は、主表面側における外周部の厚さよりも中央部の厚さが厚く形成されており、
前記酸化層は、主表面側における外周部の厚さよりも中央部の厚さが厚く形成されていることを特徴とするマスクブランク。
前記薄膜は、露光光に対して1%以上の透過率を有する半透過膜であることを特徴とする構成1記載のマスクブランク。
(構成3)
前記薄膜は、露光光に対して1%以上の透過率を有し、かつ、前記薄膜を透過した露光光と前記薄膜の膜厚と同じ距離だけ空気中を通過した露光光との間に位相差を生じさせるハーフトーン位相シフト膜であることを特徴とする構成1記載のマスクブランク。
前記薄膜は、前記透過率の面内分布が0.6%の範囲内であることを特徴とする構成2または3に記載のマスクブランク。
(構成5)
前記薄膜は、前記位相差の面内分布が4度の範囲内であることを特徴とする構成3に記載のマスクブランク。
透光性基板の主表面上に、転写パターン形成用の薄膜を備えたマスクブランクの製造方法であって、
前記透光性基板の主表面上に、遷移金属とケイ素を含有するターゲットを用い、酸素または窒素のうち少なくともいずれかを含有するスパッタリングガス中でスパッタリング法により前記薄膜を形成する薄膜形成工程と、
前記薄膜形成工程で形成した前記薄膜に対し、酸素を含有する気体中で加熱処理および強制冷却処理を行う加熱冷却処理工程とを有し、
前記薄膜形成工程は、前記薄膜を主表面側おける外周部の厚さよりも中央部の厚さを厚くなるように形成する工程であり、
前記加熱冷却処理工程は、前記薄膜の表層にその表層を除く領域の薄膜よりも酸素含有量が多い酸化層を形成する工程であり、かつ前記酸化層を主表面側における外周部の厚さよりも中央部の厚さが厚くなるように形成する工程であることを特徴とするマスクブランクの製造方法。
前記加熱冷却処理工程は、加熱冷却室内に、前記薄膜が形成された複数枚の前記透光性基板を、主表面を上下方向とし、かつ基板同士で間隔をおいて縦積みに配置し、加熱冷却室外であり、かつ透光性基板の端面側に配置された加熱器と冷却器によって、加熱処理と強制冷却処理を行う工程であることを特徴とする構成6記載のマスクブランクの製造方法。
(構成8)
前記加熱冷却処理工程は、加熱器による加熱処理を行った後であり、かつ加熱冷却室内の温度が300℃以上のときに、冷却器による強制冷却処理を行う工程であることを特徴とする構成7記載のマスクブランクの製造方法。
前記薄膜形成工程は、前記透光性基板を主表面の中心を通る回転軸で回転させ、スパッタリングターゲットのスパッタ面を、前記透光性基板の主表面と対向し、かつ前記主表面に対して角度を有する位置であり、前記透光性基板の回転軸と、前記スパッタ面の中心を通り前記透光性基板の回転軸に対して平行な直線とがずれた位置に配置し、スパッタリング法によって前記薄膜を形成することを特徴とする構成6から8のいずれかに記載のマスクブランクの製造方法。
(構成10)
前記薄膜は、露光光に対して1%以上の透過率を有する半透過膜であることを特徴とする構成6から9のいずれかに記載のマスクブランクの製造方法。
前記薄膜は、露光光に対して1%以上の透過率を有し、かつ、前記薄膜を透過した露光光と前記薄膜の膜厚と同じ距離だけ空気中を通過した露光光との間に位相差を生じさせるハーフトーン位相シフト膜であることを特徴とする構成6から9のいずれかに記載のマスクブランクの製造方法。
(構成12)
前記薄膜は、前記透過率の面内分布が0.6%の範囲内であることを特徴とする構成10または11に記載のマスクブランクの製造方法。
前記薄膜は、前記位相差の面内分布が4度の範囲内であることを特徴とする構成11記載のマスクブランクの製造方法。
(構成14)
構成1から5のいずれかに記載のマスクブランクの前記薄膜に転写パターンが形成されていることを特徴とする転写用マスク。
構成6から13のいずれかに記載のマスクブランクの製造方法で製造されたマスクブランクの前記薄膜に転写パターンを形成するパターン形成工程を有することを特徴とする転写用マスクの製造方法。
本発明のマスクブランクは、構成1にあるように、透光性基板の主表面上に、転写パターン形成用の薄膜を備えたマスクブランクであって、
前記薄膜は、遷移金属とケイ素を含有し、さらに酸素または窒素のうち少なくともいずれかを含有する材料からなり、
前記薄膜は、その表層に前記表層を除く領域の薄膜よりも酸素含有量が多い酸化層を有し、
前記薄膜は、主表面側における外周部の厚さよりも中央部の厚さが厚く形成されており、
前記酸化層は、主表面側における外周部の厚さよりも中央部の厚さが厚く形成されていることを特徴とする。
前記透光性基板の主表面上に、遷移金属とケイ素を含有するターゲットを用い、酸素または窒素のうち少なくともいずれかを含有するスパッタリングガス中でスパッタリング法により前記薄膜を形成する薄膜形成工程と、
薄膜形成工程で形成した前記薄膜に対し、酸素を含有する気体中で加熱処理および強制冷却処理を行う加熱冷却処理工程とを有し、
前記薄膜形成工程は、前記薄膜を主表面側おける外周部の厚さよりも中央部の厚さを厚くなるように形成する工程であり、
前記加熱冷却処理工程は、前記薄膜の表層にその表層を除く領域の薄膜よりも酸素含有量が多い酸化層を形成する工程であり、かつ前記酸化層を主表面側における外周部の厚さよりも中央部の厚さが厚くなるように形成する工程であることを特徴とする。
また、半透過膜は、高透過率タイプを含む。高透過率タイプは、例えば、通常の透過率1~10%未満に対し、相対的に高い透過率10~30%を有するものをいう。
前記薄膜2は、位相シフトマスクやエンハンサーマスクにおける半透過膜又は、バイナリマスクにおける遮光膜、とすることができる。バイナリマスクの遮光膜においても、EMFバイアスの観点で位相差の低減が要求されており、例えば、位相差の面内分布が厳密に問われる場合においては、本願発明の適用効果がある。
本発明は、電子線描画によりレジストパターンを形成する電子線描画用のマスクブランクに適用する。
透光性基板1として、主表面が約152mm×約152mmの四角形であり、厚さが約6.25mmの合成石英ガラス基板を用い、その透光性基板1上に、モリブデン、シリコン、および窒素からなる半透過膜(薄膜)2を成膜した。半透過膜2の成膜には、図2に示す、いわゆる斜入射スパッタ方式かつ枚葉処理方式のDCスパッタリング装置を使用した。具体的には、モリブデン(Mo)とシリコン(Si)との混合ターゲット(Mo:Si=12at%:88at%)を用い、アルゴン(Ar)と窒素(N2)とヘリウム(He)との混合ガス雰囲気(ガス流量比 Ar:N2:He=8:72:100)で、反応性スパッタリング(DCスパッタリング)により、透光性基板1上に、モリブデン、シリコン及び窒素からなるMoSiN膜(位相シフト膜)2を形成した。このとき、形成される半透過膜2の平均膜厚が69nmであり、かつ中央部の膜厚が外周部の膜厚に比べて18Å程度厚くなるように、DCスパッタリング装置の成膜条件(T/S距離、オフセット距離、スパッタ電圧の諸条件)を設定した。ここで、形成される薄膜2の中央部と外周部の境界は、合成石英ガラス基板1の中心を基準とした一辺が132mmの四角形とした。また、その境界から内側の領域を中央部とし、その境界から外側の領域を外周部とした。なお、ここでは、酸化層22形成後における位相シフト膜(マスクブランク3が完成したときの位相シフト膜)2が、ArFエキシマレーザーの波長193nmの露光光に対する透過率が6%であり、かつ位相シフト量が177度になるように成膜条件を設定した。
実施例1と同様に、透光性基板1上に、モリブデン、シリコン、および窒素からなる半透過膜(薄膜)4を成膜した。ただし、この比較例では、DCスパッタリング装置で半透過膜を成膜する際、膜厚が主表面側で出来る限り均一になるような成膜条件を適用した。このため、透光性基板1上に形成されたMoSiN膜(位相シフト膜)4は、外周部と中央部の膜厚差が5Å程度と、実施例1に比べると大幅に小さかった。同様の手順で比較例1のMoSiN膜(位相シフト膜)4を成膜した透光性基板1を5枚作成した。さらに比較例1の位相シフト膜4を有する透光性基板5枚に対して、実施例1と同条件で加熱処理および強制冷却処理を行った。この加熱処理および強制冷却処理を行ったことにより、MoSiN膜(位相シフト膜)4の表層に酸化層42が形成されていた。
上記実施例1で製造した位相シフトマスクブランク3の位相シフト膜2上に、クロムを含有する材料からなる遮光膜を成膜し、遮光膜を有する位相シフトマスクブランクを作製した。成膜した遮光膜は、位相シフト膜2側からCrCON膜(膜厚30nm)、CrN膜(膜厚4nm)、CrOCN膜(膜厚14nm)が順に積層した構造とした。このMoSiNからなる位相シフト膜2とCr系材料からなる遮光膜の積層構造で、ArFエキシマレーザーの波長(193nm)に対する光学濃度は3.1であった。
続いて、上記レジストパターンをマスクとして、遮光膜のエッチングを行って遮光膜パターンを形成した。ドライエッチングガスとして、Cl2とO2の混合ガスを用いた。
次に、上記レジストパターンまたは遮光膜パターンをマスクとして、位相シフト膜のエッチングを行って位相シフトパターンを形成した。ドライエッチングガスとして、SF6とHeの混合ガスを用いた。
2,4 薄膜
22,42 酸化層
3,5 マスクブランク
10 石英チューブ
11 冷媒流入管
12 冷媒流出管
15 ヒーター(加熱器)
16 石英ボード
17 加熱冷却室
100 縦型炉
Claims (15)
- 透光性基板の主表面上に、転写パターン形成用の薄膜を備えたマスクブランクであって、
前記薄膜は、遷移金属とケイ素を含有し、さらに酸素または窒素のうち少なくともいずれかを含有する材料からなり、
前記薄膜は、その表層に前記表層を除く領域の薄膜よりも酸素含有量が多い酸化層を有し、
前記薄膜は、主表面側における外周部の厚さよりも中央部の厚さが厚く形成されており、
前記酸化層は、主表面側における外周部の厚さよりも中央部の厚さが厚く形成されている
ことを特徴とするマスクブランク。 - 前記薄膜は、露光光に対して1%以上の透過率を有する半透過膜であることを特徴とする請求項1記載のマスクブランク。
- 前記薄膜は、露光光に対して1%以上の透過率を有し、かつ、前記薄膜を透過した露光光と前記薄膜の膜厚と同じ距離だけ空気中を通過した露光光との間に位相差を生じさせるハーフトーン位相シフト膜であることを特徴とする請求項1記載のマスクブランク。
- 前記薄膜は、前記透過率の面内分布が0.6%の範囲内であることを特徴とする請求項2または3に記載のマスクブランク。
- 前記薄膜は、前記位相差の面内分布が4度の範囲内であることを特徴とする請求項3に記載のマスクブランク。
- 透光性基板の主表面上に、転写パターン形成用の薄膜を備えたマスクブランクの製造方法であって、
前記透光性基板の主表面上に、遷移金属とケイ素を含有するターゲットを用い、酸素または窒素のうち少なくともいずれかを含有するスパッタリングガス中でスパッタリング法により前記薄膜を形成する薄膜形成工程と、
前記薄膜形成工程で形成した前記薄膜に対し、酸素を含有する気体中で加熱処理および強制冷却処理を行う加熱冷却処理工程とを有し、
前記薄膜形成工程は、前記薄膜を主表面側おける外周部の厚さよりも中央部の厚さを厚くなるように形成する工程であり、
前記加熱冷却処理工程は、前記薄膜の表層にその表層を除く領域の薄膜よりも酸素含有量が多い酸化層を形成する工程であり、かつ前記酸化層を主表面側における外周部の厚さよりも中央部の厚さが厚くなるように形成する工程であることを特徴とするマスクブランクの製造方法。 - 前記加熱冷却処理工程は、加熱冷却室内に、前記薄膜が形成された複数枚の前記透光性基板を、主表面を上下方向とし、かつ基板同士で間隔をおいて縦積みに配置し、加熱冷却室外であり、かつ透光性基板の端面側に配置された加熱器と冷却器によって、加熱処理と強制冷却処理を行う工程であることを特徴とする請求項6記載のマスクブランクの製造方法。
- 前記加熱冷却処理工程は、加熱器による加熱処理を行った後であり、かつ加熱冷却室内の温度が300℃以上のときに、冷却器による強制冷却処理を行う工程であることを特徴とする請求項7記載のマスクブランクの製造方法。
- 前記薄膜形成工程は、前記透光性基板を主表面の中心を通る回転軸で回転させ、スパッタリングターゲットのスパッタ面を、前記透光性基板の主表面と対向し、かつ前記主表面に対して角度を有する位置であり、前記透光性基板の回転軸と、前記スパッタ面の中心を通り前記透光性基板の回転軸に対して平行な直線とがずれた位置に配置し、スパッタリング法によって前記薄膜を形成することを特徴とする請求項6から8のいずれかに記載のマスクブランクの製造方法。
- 前記薄膜は、露光光に対して1%以上の透過率を有する半透過膜であることを特徴とする請求項6から9のいずれかに記載のマスクブランクの製造方法。
- 前記薄膜は、露光光に対して1%以上の透過率を有し、かつ、前記薄膜を透過した露光光と前記薄膜の膜厚と同じ距離だけ空気中を通過した露光光との間に位相差を生じさせるハーフトーン位相シフト膜であることを特徴とする請求項6から9のいずれかに記載のマスクブランクの製造方法。
- 前記薄膜は、前記透過率の面内分布が0.6%の範囲内であることを特徴とする請求項10または11に記載のマスクブランクの製造方法。
- 前記薄膜は、前記位相差の面内分布が4度の範囲内であることを特徴とする請求項11記載のマスクブランクの製造方法。
- 請求項1から5のいずれかに記載のマスクブランクの前記薄膜に転写パターンが形成されていることを特徴とする転写用マスク。
- 請求項6から13のいずれかに記載のマスクブランクの製造方法で製造されたマスクブランクの前記薄膜に転写パターンを形成するパターン形成工程を有することを特徴とする転写用マスクの製造方法。
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KR101656456B1 (ko) * | 2009-10-30 | 2016-09-12 | 삼성전자주식회사 | 하프톤형 위상반전 블랭크 포토마스크와 하프톤형 위상반전 포토마스크 및 그의 제조방법 |
CN105739233B (zh) * | 2010-04-09 | 2019-11-05 | Hoya株式会社 | 相移掩模坯料及其制造方法、以及相移掩模 |
US8535855B2 (en) * | 2010-05-19 | 2013-09-17 | Hoya Corporation | Mask blank manufacturing method, transfer mask manufacturing method, mask blank, and transfer mask |
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- 2013-02-08 WO PCT/JP2013/053053 patent/WO2013140887A1/ja active Application Filing
- 2013-02-21 TW TW105125497A patent/TWI610125B/zh active
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JP2004318184A (ja) * | 2000-09-12 | 2004-11-11 | Hoya Corp | 位相シフトマスクブランク、位相シフトマスク |
JP2003248291A (ja) * | 2002-02-22 | 2003-09-05 | Hoya Corp | ハーフトーン型位相シフトマスクブランク及びハーフトーン型位相シフトマスク |
JP2010250344A (ja) * | 2010-06-21 | 2010-11-04 | Hoya Corp | フォトマスクブランクの製造方法 |
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JP2018077418A (ja) * | 2016-11-11 | 2018-05-17 | Hoya株式会社 | マスクブランク、転写用マスク、転写用マスクの製造方法および半導体デバイスの製造方法 |
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SG10201605431QA (en) | 2016-08-30 |
TWI610125B (zh) | 2018-01-01 |
TWI585515B (zh) | 2017-06-01 |
JP2013225109A (ja) | 2013-10-31 |
SG10201509797RA (en) | 2015-12-30 |
KR20140070660A (ko) | 2014-06-10 |
JP2013225139A (ja) | 2013-10-31 |
JP5976715B2 (ja) | 2016-08-24 |
KR101430395B1 (ko) | 2014-08-13 |
SG11201405526UA (en) | 2014-11-27 |
KR20140127203A (ko) | 2014-11-03 |
TW201642021A (zh) | 2016-12-01 |
KR101922309B1 (ko) | 2018-11-26 |
US20150072273A1 (en) | 2015-03-12 |
US9952498B2 (en) | 2018-04-24 |
JP2014194547A (ja) | 2014-10-09 |
TW201346434A (zh) | 2013-11-16 |
US20170010526A1 (en) | 2017-01-12 |
KR101588150B1 (ko) | 2016-01-25 |
KR20160009711A (ko) | 2016-01-26 |
US9470970B2 (en) | 2016-10-18 |
JP5286455B1 (ja) | 2013-09-11 |
JP5530550B2 (ja) | 2014-06-25 |
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